The search service can find package by either name (apache),
provides(webserver), absolute file names (/usr/bin/apache),
binaries (gprof) or shared libraries (libXm.so.2) in
standard path. It does not support multiple arguments yet...

The System and Arch are optional added filters, for example
System could be "redhat", "redhat-7.2", "mandrake" or "gnome",
Arch could be "i386" or "src", etc. depending on your system.

System
Arch

RPM resource python-crypto

PyCrypto is a collection of both secure hash functions (such as MD5 and
SHA), and various encryption algorithms (AES, DES, RSA, ElGamal, etc.).